Cinderella is a shy and insecure teenager living in the Kingdom of Once Upon a Time, along with many characters from the classic fairy tales. She studies at the Brothers Grimm Institute, along with the Frog Prince, Beast, a lot of fairies, some haughty princesses and her batty and annoying stepsisters. Nobody suspects that this timid little mouse is actually a heroine that everyone admires: the Masked Princess. Only Merlin, a nerdy magician’s apprentice who thinks he is allergic to magic, knows her secret. Together, Merlin's crazy creativity and Cinderella's overwhelming empathy will save the kingdom – when they’re not being locked in dungeons, tricked by trolls or turned into pumpkins…